/*
** $Id: lua.h,v 1.101 2001/07/12 18:11:58 roberto Exp roberto $
** Lua - An Extensible Extension Language
** TeCGraf: Grupo de Tecnologia em Computacao Grafica, PUC-Rio, Brazil
** e-mail: info@lua.org
** www: http://www.lua.org
** See Copyright Notice at the end of this file
*/


#ifndef lua_h
#define lua_h


/* definition of `size_t' */
#include <stddef.h>


#define LUA_VERSION	"Lua 4.1 (alpha)"
#define LUA_COPYRIGHT	"Copyright (C) 1994-2001 TeCGraf, PUC-Rio"
#define LUA_AUTHORS 	"W. Celes, R. Ierusalimschy & L. H. de Figueiredo"


/* name of global variable with error handler */
#define LUA_ERRORMESSAGE	"_ERRORMESSAGE"


/* pre-defined references */
#define LUA_NOREF	(-2)
#define LUA_REFNIL	(-1)


/* option for multiple returns in `lua_call' */
#define LUA_MULTRET	(-1)


/* error codes for `lua_do*' and the like */
#define LUA_ERRRUN	1
#define LUA_ERRFILE	2
#define LUA_ERRSYNTAX	3
#define LUA_ERRMEM	4
#define LUA_ERRERR	5

/* weak-table modes */
#define LUA_WEAK_KEY	1
#define LUA_WEAK_VALUE	2


typedef struct lua_State lua_State;

typedef int (*lua_CFunction) (lua_State *L);


/*
** an invalid `tag'
*/
#define LUA_NOTAG	(-1)

/*
** tags for basic types
*/
#define LUA_TNONE	LUA_NOTAG

#define LUA_TUSERDATA	0
#define LUA_TNIL	1
#define LUA_TNUMBER	2
#define LUA_TSTRING	3
#define LUA_TTABLE	4
#define LUA_TFUNCTION	5


/* minimum Lua stack available to a C function */
#define LUA_MINSTACK	20


/*
** generic extra include file
*/
#ifdef LUA_USER_H
#include LUA_USER_H
#endif


/* Lua numerical type */
#ifndef LUA_NUMBER
#define LUA_NUMBER	double
#endif
typedef LUA_NUMBER lua_Number;

/* Lua character type */
#ifndef L_CHAR
#define L_CHAR	char
#endif
typedef L_CHAR lua_char;


/* mark for all API functions */
#ifndef LUA_API
#define LUA_API		extern
#endif


/*
** state manipulation
*/
LUA_API lua_State *lua_newthread (lua_State *L, int stacksize);
LUA_API void       lua_close (lua_State *L);


/*
** basic stack manipulation
*/
LUA_API int   lua_gettop (lua_State *L);
LUA_API void  lua_settop (lua_State *L, int index);
LUA_API void  lua_pushvalue (lua_State *L, int index);
LUA_API void  lua_remove (lua_State *L, int index);
LUA_API void  lua_insert (lua_State *L, int index);
LUA_API int   lua_stackspace (lua_State *L);


/*
** access functions (stack -> C)
*/

LUA_API const lua_char *lua_type (lua_State *L, int index);
LUA_API int             lua_isnumber (lua_State *L, int index);
LUA_API int             lua_isstring (lua_State *L, int index);
LUA_API int             lua_iscfunction (lua_State *L, int index);
LUA_API int             lua_tag (lua_State *L, int index);
LUA_API int             lua_rawtag (lua_State *L, int index);

LUA_API int            lua_equal (lua_State *L, int index1, int index2);
LUA_API int            lua_lessthan (lua_State *L, int index1, int index2);

LUA_API lua_Number      lua_tonumber (lua_State *L, int index);
LUA_API const lua_char *lua_tostring (lua_State *L, int index);
LUA_API size_t          lua_strlen (lua_State *L, int index);
LUA_API lua_CFunction   lua_tocfunction (lua_State *L, int index);
LUA_API void	       *lua_touserdata (lua_State *L, int index);
LUA_API const void     *lua_topointer (lua_State *L, int index);


/*
** push functions (C -> stack)
*/
LUA_API void  lua_pushnil (lua_State *L);
LUA_API void  lua_pushnumber (lua_State *L, lua_Number n);
LUA_API void  lua_pushlstring (lua_State *L, const lua_char *s, size_t len);
LUA_API void  lua_pushstring (lua_State *L, const lua_char *s);
LUA_API void  lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);


/*
** get functions (Lua -> stack)
*/
LUA_API void  lua_getglobal (lua_State *L, const lua_char *name);
LUA_API void  lua_gettable (lua_State *L, int index);
LUA_API void  lua_rawget (lua_State *L, int index);
LUA_API void  lua_rawgeti (lua_State *L, int index, int n);
LUA_API void  lua_getglobals (lua_State *L);
LUA_API void  lua_gettagmethod (lua_State *L, int tag, const lua_char *event);
LUA_API int   lua_getref (lua_State *L, int ref);
LUA_API void  lua_newtable (lua_State *L);
LUA_API void  lua_getregistry (lua_State *L);
LUA_API void  lua_getweakregistry (lua_State *L);


/*
** set functions (stack -> Lua)
*/
LUA_API void  lua_setglobal (lua_State *L, const lua_char *name);
LUA_API void  lua_settable (lua_State *L, int index);
LUA_API void  lua_rawset (lua_State *L, int index);
LUA_API void  lua_rawseti (lua_State *L, int index, int n);
LUA_API void  lua_setglobals (lua_State *L);
LUA_API void  lua_settagmethod (lua_State *L, int tag, const lua_char *event);
LUA_API int   lua_ref (lua_State *L, int lock);


/*
** `load' and `do' functions (load and run Lua code)
*/
LUA_API int   lua_call (lua_State *L, int nargs, int nresults);
LUA_API void  lua_rawcall (lua_State *L, int nargs, int nresults);
LUA_API int   lua_loadfile (lua_State *L, const lua_char *filename);
LUA_API int   lua_dofile (lua_State *L, const lua_char *filename);
LUA_API int   lua_dostring (lua_State *L, const lua_char *str);
LUA_API int   lua_loadbuffer (lua_State *L, const lua_char *buff, size_t size,
                            const lua_char *name);
LUA_API int   lua_dobuffer (lua_State *L, const lua_char *buff, size_t size,
                            const lua_char *name);

/*
** Garbage-collection functions
*/
LUA_API int   lua_getgcthreshold (lua_State *L);
LUA_API int   lua_getgccount (lua_State *L);
LUA_API void  lua_setgcthreshold (lua_State *L, int newthreshold);

/*
** miscellaneous functions
*/
LUA_API int   lua_newtype (lua_State *L, const lua_char *name, int basictype);
LUA_API int   lua_copytagmethods (lua_State *L, int tagto, int tagfrom);
LUA_API void  lua_settag (lua_State *L, int tag);

LUA_API int             lua_name2tag (lua_State *L, const lua_char *name);
LUA_API const lua_char *lua_tag2name (lua_State *L, int tag);

LUA_API void  lua_error (lua_State *L, const lua_char *s);

LUA_API void  lua_unref (lua_State *L, int ref);

LUA_API int   lua_next (lua_State *L, int index);
LUA_API int   lua_getn (lua_State *L, int index);

LUA_API void  lua_concat (lua_State *L, int n);

LUA_API void *lua_newuserdata (lua_State *L, size_t size);
LUA_API void  lua_newuserdatabox (lua_State *L, void *u);

LUA_API void  lua_setweakmode (lua_State *L, int mode);
LUA_API int   lua_getweakmode (lua_State *L, int index);


/* 
** ===============================================================
** some useful macros
** ===============================================================
*/

#define lua_open(n)		lua_newthread(NULL, (n))

#define lua_pop(L,n)		lua_settop(L, -(n)-1)

#define lua_register(L,n,f)	(lua_pushcfunction(L, f), lua_setglobal(L, n))
#define lua_pushcfunction(L,f)	lua_pushcclosure(L, f, 0)
#define lua_clonetag(L,t)	lua_copytagmethods(L, lua_newtag(L), (t))

#define lua_isfunction(L,n)	(lua_rawtag(L,n) == LUA_TFUNCTION)
#define lua_istable(L,n)	(lua_rawtag(L,n) == LUA_TTABLE)
#define lua_isuserdata(L,n)	(lua_rawtag(L,n) == LUA_TUSERDATA)
#define lua_isnil(L,n)		(lua_rawtag(L,n) == LUA_TNIL)
#define lua_isnull(L,n)		(lua_rawtag(L,n) == LUA_TNONE)

#define lua_pushliteral(L, s)	lua_pushlstring(L, s, \
                                                (sizeof(s)/sizeof(lua_char))-1)


/*
** compatibility macros
*/
#define lua_newtag(L)	lua_newtype(L, NULL, LUA_TNONE)
#define lua_typename	lua_tag2name

#endif


/*
** {======================================================================
** useful definitions for Lua kernel and libraries
*/
#ifdef LUA_PRIVATE

#define l_char	lua_char

/* macro to control type of literal strings */
#ifndef l_s
#define l_s(x)  x
#endif

/* macro to control type of literal chars */
#ifndef l_c
#define l_c(x)  x
#endif

/* macro to `unsign' a character */
#ifndef uchar
#define uchar(c)        ((unsigned char)(c))
#endif

/* integer type to hold the result of fgetc */
#ifndef l_charint
#define l_charint	int
#endif

/*
** formats for Lua numbers
*/
#ifndef LUA_NUMBER_SCAN
#define LUA_NUMBER_SCAN		"%lf"
#endif
#ifndef LUA_NUMBER_FMT
#define LUA_NUMBER_FMT		"%.16g"
#endif
/* function to convert a lua_Number to a string */
#ifndef lua_number2str
#define lua_number2str(s,n)     sprintf((s), l_s(LUA_NUMBER_FMT), (n))
#endif

/* function to convert a string to a lua_Number */
#ifndef lua_str2number
#define lua_str2number(s,p)     strtod((s), (p))
#endif

#endif
/* }====================================================================== */


/******************************************************************************
* Copyright (C) 1994-2001 TeCGraf, PUC-Rio.  All rights reserved.
* 
* Permission is hereby granted, without written agreement and without license
* or royalty fees, to use, copy, modify, and distribute this software and its
* documentation for any purpose, including commercial applications, subject to
* the following conditions:
* 
*  - The above copyright notice and this permission notice shall appear in all
*    copies or substantial portions of this software.
* 
*  - The origin of this software must not be misrepresented; you must not
*    claim that you wrote the original software. If you use this software in a
*    product, an acknowledgment in the product documentation would be greatly
*    appreciated (but it is not required).
* 
*  - Altered source versions must be plainly marked as such, and must not be
*    misrepresented as being the original software.
*    
* The authors specifically disclaim any warranties, including, but not limited
* to, the implied warranties of merchantability and fitness for a particular
* purpose.  The software provided hereunder is on an "as is" basis, and the
* authors have no obligation to provide maintenance, support, updates,
* enhancements, or modifications.  In no event shall TeCGraf, PUC-Rio, or the
* authors be held liable to any party for direct, indirect, special,
* incidental, or consequential damages arising out of the use of this software
* and its documentation.
* 
* The Lua language and this implementation have been entirely designed and
* written by Waldemar Celes Filho, Roberto Ierusalimschy and
* Luiz Henrique de Figueiredo at TeCGraf, PUC-Rio.
*
* This implementation contains no third-party code.
******************************************************************************/